Deep sea outboard electric drive integrated motor with mutually embedded three-dimensional heat conduction and dissipation structure

Abstract

The invention discloses a deep sea outboard external drive integrated motor with a mutually-embedded type three-dimensional heat conduction and dissipation structure, the mutually-embedded type three-dimensional heat conduction and dissipation structure is formed by matching a heat conduction metal plate and a driving machine shell, the heat conduction metal plate is provided with a panel, two side plates and a plurality of embedded ribs, the two side plates are respectively connected with the two transverse sides of the panel, and the embedded ribs are connected with the two transverse sides of the panel. The panel and the side plate are attached to the rear cavity wall and the side cavity wall of the driving machine shell respectively. The plurality of embedded ribs are uniformly arranged at intervals along the transverse direction of the panel, so that the heat-conducting metal plate is in full contact with the driving machine shell, and the heat-conducting resistance is reduced; in addition, the embedded ribs protruding out of the outer side of the heat conduction metal plate are embedded into the driving machine shell, so that the heat conduction performance is improved, and meanwhile mechanical positioning and fixing are provided; moreover, the embedded ribs are arranged in multiple directions (namely, the bottom ribs and the side ribs), so that a three-dimensional heat dissipation channel is constructed in the motor, and compared with the mode that heat dissipation fins or heat dissipation water channels are purely arranged on the shell, the problem that the heat conduction resistance in the underwater integrated motor is large can be effectively solved.

Description

Technical Field

[0001] This invention belongs to the field of motor heat dissipation technology, specifically relating to a deep-sea outboard electric drive integrated motor with an interlocking three-dimensional heat conduction structure. Background Technology

[0002] Deep-sea motors are core power or actuation components of underwater vehicles and robots, and their size and mass directly determine the load-bearing capacity and operational performance of the underwater equipment. Therefore, given a limited output power, reducing the size of the motor system (including the motor body and controller), i.e., increasing the system's power density, is extremely important for underwater equipment. Currently, underwater vehicles such as AUVs generally have slender and confined hulls to achieve deeper diving depths. Therefore, the drive unit of the deep-sea motor is often integrated with the motor body to reduce the system's size and mass. To achieve a lighter system mass and volume, deep-sea motors are often required to be placed overboard, meaning that the motor and actuator must not only withstand the high pressure of the deep sea but also utilize stainless steel casings with high mass density and low thermal conductivity. Therefore, the design of underwater motors differs somewhat from that of terrestrial and aerospace motors. Currently, there are many solutions for addressing the pressure resistance of motors, such as increasing wall thickness to resist pressure or using pressure-compensating hoses, both of which can effectively withstand pressure. Pressure compensation requires filling the casing with oil, making it suitable for the motor itself but difficult to use in the actuator housing with numerous electronic components. Therefore, the actuator is often placed in a thick-walled dry chamber. This thick-walled actuator housing with poor thermal conductivity severely hinders heat dissipation. Furthermore, in this integrated electric drive system, where the motor and actuator are integrated, the motor's heat also affects the actuator's cooling. Therefore, designing an effective heat dissipation method for an integrated underwater electric drive motor is crucial for improving the performance of underwater equipment.

[0003] Currently, the main technologies for motor heat dissipation include: increasing the heat dissipation area with finned casings, water cooling systems, and heat pipes. However, adding fins only increases the heat exchange capacity of the casing surface. The thick stainless steel of underwater motors, with its extremely low thermal conductivity, is difficult to dissipate heat, resulting in limited heat dissipation from the surface. Furthermore, since these outboard motors are already submerged in seawater, there is no need to add a water cooling system. As for heat pipes, they need to connect the inner dry cavity to the seawater; the pressure difference between the inside and outside will damage the hollow heat pipes.

[0004] In other words, the main problem currently facing heat dissipation challenges in deep-sea motor drive systems is the excessively high thermal resistance of the stainless steel casing. The thermal conductivity of stainless steel is typically 13.4 W / m / ℃. Furthermore, although deep-sea motors are placed in seawater, the surrounding seawater temperature is influenced by other equipment and is not significantly different from room temperature. Moreover, the temperature resistance of the various electronic components in the drive system is generally around 50℃. Therefore, traditional heat dissipation methods are insufficient to effectively and promptly remove the heat from the drive components of the integrated electric motor. Summary of the Invention

[0005] The problem to be solved by the present invention is to provide an integrated deep-sea outboard electric drive motor with an interlocking three-dimensional heat dissipation structure, which can dissipate the heat of the drive in a timely manner under the premise of stainless steel housing, without affecting the pressure resistance depth of the motor system.

[0006] To address the aforementioned technical problems, this invention provides a deep-sea outboard electric drive integrated motor with an interlocking three-dimensional heat-conducting structure. The motor includes a motor body, a drive housing, a driver, and a heat-conducting sheet metal. The front end of the motor body is the output end. The drive housing is sealed to the rear end of the motor body. The driver is disposed within the drive housing and electrically connected to the motor body. The heat-conducting sheet metal has a front panel, two side plates, and multiple embedded ribs. Two side plates are provided and are respectively connected to the lateral sides of the front panel. The front panel and the side plates are respectively connected to… The rear cavity wall and side cavity wall of the drive housing are fitted together; multiple embedded ribs are evenly spaced along the transverse direction of the panel, each embedded rib having a bottom rib and side ribs connected to both ends of the bottom rib. The bottom rib is fixedly connected to the surface of the panel that fits with the drive housing, and the side ribs extend in a direction perpendicular to the panel and surround the side plate and the panel to form an accommodating cavity for placing the driver; the rear cavity wall of the drive housing has a rear slot that mates with the bottom rib, and the side cavity wall of the drive housing has a side slot that mates with the side rib.

[0007] As a preferred embodiment of the present invention, thermally conductive adhesive is coated in the fit gap between the thermally conductive sheet metal and the drive housing.

[0008] As a preferred embodiment of the present invention, the panel is provided with adhesive discharge holes.

[0009] In a preferred embodiment of the present invention, the thermally conductive sheet metal is fixed to the drive housing by screws.

[0010] As a preferred embodiment of the present invention, heat sinks are evenly distributed on the outer surface of the drive housing.

[0011] As a preferred embodiment of the present invention, the heat sink is a cylindrical heat sink.

[0012] As a preferred embodiment of the present invention, the thermally conductive sheet metal is made of copper, aluminum, or an aluminum alloy.

[0013] The deep-sea outboard electric drive integrated motor with an interlocking three-dimensional heat dissipation structure, which implements the embodiments of the present invention, has the following beneficial effects compared with the prior art:

[0014] The deep-sea outboard electric drive integrated motor of this invention utilizes an interlocking three-dimensional heat dissipation structure formed by the cooperation of thermally conductive sheet metal and the drive housing. This ensures full contact between the thermally conductive sheet metal and the drive housing, reducing thermal resistance. Furthermore, the protruding embedded ribs on the outer side of the thermally conductive sheet metal, embedded into the drive housing, not only increase thermal conductivity but also provide mechanical positioning and fixation, resulting in a more compact structure. Moreover, the multi-directional arrangement of the embedded ribs (i.e., bottom and side ribs) constructs a three-dimensional heat dissipation pathway within the motor. Compared to simply adding heat dissipation fins or external cooling channels to the housing, this effectively solves the problem of high internal thermal resistance in underwater integrated motors. Therefore, the deep-sea outboard electric drive integrated motor of this invention, with its stainless steel housing, can effectively dissipate heat from the drive unit without affecting the pressure resistance depth of the motor system. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0016] Figure 1 This is an isometric view of a deep-sea outboard electric drive integrated motor with an interlocking three-dimensional heat dissipation structure according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the internal structure of the deep-sea outboard electric drive integrated motor with an interlocking three-dimensional heat dissipation structure according to an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the thermally conductive sheet metal in an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the structure in which the thermally conductive sheet metal and the driver are installed together in an embodiment of the present invention. Figure 1 ;

[0020] Figure 5 This is a schematic diagram of the structure in which the thermally conductive sheet metal and the driver are installed together in an embodiment of the present invention. Figure 2 ;

[0021] Figure 6 This is a schematic diagram of the drive housing of the present invention;

[0022] Figure 7 This is a temperature distribution cloud map of the driver and motor of a deep-sea outboard electric drive integrated motor without an "interlocking three-dimensional heat dissipation structure" when the motor is operating at a rated power of 8.5 kW.

[0023] Figure 8This is a temperature distribution cloud map of the driver and motor of a deep-sea outboard electric drive integrated motor with an interlocking three-dimensional heat conduction structure when the motor is operating at a rated power of 8.5 kW.

[0024] Marked in the image:

[0025] 1. Motor body; 2. Drive housing; 3. Driver; 4. Thermally conductive sheet metal; 41. Panel; 42. Side plate; 43. Embedded rib; 431. Bottom rib; 432. Side rib; 21. Rear slot; 22. Side slot; 23. Heat sink. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., used to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] like Figures 1 to 6 As shown, this is a preferred embodiment of the present invention.

[0029] A deep-sea outboard electric drive integrated motor with an interlocking three-dimensional heat dissipation structure includes a motor body 1, a drive housing 2 (preferably a stainless steel housing according to underwater pressure resistance requirements), a driver 3, and a heat-conducting sheet metal 4. The front end of the motor body 1 is the output end. The drive housing 2 is sealed to the rear end of the motor body 1. The driver 3 is disposed inside the drive housing 2 and electrically connected to the motor body 1. The heat-conducting sheet metal 4 has a front panel 41, two side plates 42, and multiple embedded ribs 43. The two side plates 42 are respectively connected to the lateral sides of the front panel 41. The front panel 41 and the side plates 42 are respectively connected to the rear end of the drive housing 2. The cavity wall and side cavity wall are fitted together; multiple embedded ribs 43 are evenly arranged at intervals along the transverse direction of the panel 41. Each embedded rib 43 has a bottom rib 431 and side ribs 432 connected to both ends of the bottom rib 431. The bottom rib 431 is fixedly connected to the surface of the panel 41 that is fitted with the drive housing 2. The side ribs 432 extend in a direction perpendicular to the panel 41 and surround the side plate 42 and the panel 41 to form an accommodating cavity for the driver 3 to be placed. The rear cavity wall of the drive housing 2 is provided with a rear slot 21 that mates with the bottom rib 431, and the side cavity wall of the drive housing 2 is provided with a side slot 22 that mates with the side rib 432.

[0030] The deep-sea outboard electric drive integrated motor of this invention utilizes an interlocking three-dimensional heat dissipation structure formed by the cooperation of the heat-conducting sheet metal 4 and the drive housing 2, ensuring full contact between the heat-conducting sheet metal 4 and the drive housing 2 and reducing thermal resistance. Furthermore, the protruding embedded ribs 43 on the outer side of the heat-conducting sheet metal 4, embedded into the drive housing 2, not only increase thermal conductivity but also provide mechanical positioning and fixation, resulting in a more compact structure. Moreover, the multi-directional arrangement of the embedded ribs 43 (i.e., bottom ribs 431 and side ribs 432) constructs a three-dimensional heat dissipation pathway within the motor, effectively solving the problem of high internal thermal resistance in the underwater integrated motor compared to simply adding heat dissipation fins or external cooling channels to the housing. Therefore, the deep-sea outboard electric drive integrated motor of this invention, with its stainless steel housing, can effectively dissipate heat from the driver 3 without affecting the pressure resistance depth of the motor system.

[0031] It is important to note that due to the potential assembly gap between the thermally conductive sheet metal 4 and the drive housing 2, a significant contact thermal resistance exists, which greatly impacts thermal conductivity. Therefore, it is essential to press them firmly during assembly, and thermally conductive adhesive (such as thermal grease) must be applied within the mating gap between the thermally conductive sheet metal 4 and the drive housing 2. To facilitate the coverage of the thermally conductive adhesive, drainage holes (not shown in the figure) need to be provided on the panel 41 to allow the thermally conductive adhesive to flow within the gap. If drainage holes are not provided, since the thermally conductive sheet metal 4 and the drive housing 2 are tightly fitted, excess thermally conductive grease will not be able to drain, resulting in insufficient contact between the thermally conductive sheet metal 4 and the drive housing 2, thus increasing thermal resistance.

[0032] For example, the thermally conductive sheet metal 4 is fixed to the drive housing 2 with screws to ensure the reliability of the thermally conductive sheet metal 4 after assembly.

[0033] For example, heat sinks 23 are evenly distributed on the outer surface of the drive housing 2 to further improve heat dissipation efficiency.

[0034] Preferably, the heat sink 23 is a cylindrical heat sink to enhance the stability of the heat sink 23 structure.

[0035] For example, the thermally conductive sheet metal 4 is made of copper, aluminum, or aluminum alloy, thus possessing strong thermal conductivity. Taking aluminum as an example, its thermal conductivity is 168 W / m / ℃, meaning that aluminum's thermal conductivity is 12.5 times that of stainless steel.

[0036] To illustrate the heat dissipation effect of the deep-sea outboard electric drive integrated motor with an interlocking three-dimensional heat-conducting structure proposed in the embodiments of the present invention, CFD thermal simulations were performed on systems without special heat-conducting structures and systems with interlocking three-dimensional heat-conducting structures:

[0037] Figure 7 The image shows a temperature distribution cloud map of the driver 3 and motor at a rated operating power of 8.5 kW when the driver 3 is in direct contact with the 2205 stainless steel driver housing 2, without the "interlocking three-dimensional heat conduction structure". Figure 7 It is clear from the data that the highest temperature of the drive exceeds 90℃. This temperature is far beyond the drive's safe operating temperature (around 60℃). Furthermore, from... Figure 7 It can also be seen that the heat is basically conducted through the bottom surface of the drive housing, while the surrounding cylindrical shape does not effectively utilize the heat.

[0038] Figure 8 The image shows temperature distribution cloud maps of the deep-sea outboard electric drive integrated motor with an interlocking three-dimensional heat conduction structure, in both the drive unit 3 and the motor at a rated operating power of 8.5 kW. Figure 8 As can be seen, the highest temperature is below 55℃, ensuring the reliable operation of the system.

[0039] In the description of this invention, it should be understood that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A deep-sea outboard electric drive integrated motor with an interlocking three-dimensional heat dissipation structure, characterized in that: It includes a motor body, a drive housing, a driver and a heat-conducting sheet metal, the front end of the motor body is an output end, the drive housing is sealed and connected to the rear end of the motor body, and the driver is arranged in the drive housing and electrically connected to the motor body; the heat-conducting sheet metal is provided with a panel, two side panels and a plurality of embedded ribs, the side panels are provided with two and are respectively connected to the lateral sides of the panel, and the panel and the side panels are respectively fitted with the rear cavity wall and the side cavity wall of the drive housing; the plurality of embedded ribs are evenly arranged at intervals along the lateral direction of the panel, the embedded ribs are provided with a bottom rib and side ribs connected to the two ends of the bottom rib, the bottom rib is fixedly connected to the surface where the panel and the drive housing are fitted, the side ribs extend in a direction perpendicular to the panel and are enclosed with the side panels and the panel to form a receiving cavity for placing the driver; the rear cavity wall of the drive housing is provided with a rear slot that is plugged in with the bottom rib, and the side cavity wall of the drive housing is provided with a side slot that is plugged in with the side rib.

2. The deep-sea outboard electric drive integrated motor with an interlocking three-dimensional heat dissipation structure according to claim 1, characterized in that: The matching gap between the heat-conducting sheet metal and the driving housing is coated with heat-conducting glue.

3. The deep-sea outboard electric drive integrated motor with an interlocking three-dimensional heat dissipation structure as claimed in claim 2, characterized in that: The panel is provided with a glue discharge hole.

4. The deep-sea outboard electric drive integrated motor with an interlocking three-dimensional heat dissipation structure according to claim 1, characterized in that: The heat-conducting sheet metal is fixed to the driving housing by screws.

5. The deep-sea outboard electric drive integrated motor with an interlocking three-dimensional heat dissipation structure according to claim 1, characterized in that: The outer surface of the driving housing is evenly distributed with heat sinks.

6. The deep-sea outboard electric drive integrated motor with an interlocking three-dimensional heat dissipation structure as claimed in claim 5, characterized in that: The heat sink is a cylindrical heat sink.

7. The deep-sea outboard electric drive integrated motor with an interlocking three-dimensional heat dissipation structure according to claim 1, characterized in that: The heat-conducting sheet metal is made of copper, aluminum or aluminum alloy.

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